Mass typo fixes

This is a HUGE commit:

    417 files changed, 874 insertions(+), 874 deletions(-)

As the IOCCC website now is https enabled I have updated the
'http://www.ioccc' to 'https://www.ioccc'.

There was also a typo in Makefiles where it said 'for VERY WELCOME' when
it should be 'are VERY WELCOME'.

Finally slashdot.org is also https enabled so references to
'http://slashdot' were changed to 'https://slashdot'.

This was done by my sgit tool (see https://github.com/xexyl/sgit)
like:

    sgit -e 's,http://www.ioccc,https://www.ioccc,g' -e 's/for VERY WELCOME/are VERY WELCOME/g' -e  .

but because I didn't have a list of files that should be modified I had
to be careful which files to commit as I had files that were changed but
not ready to be committed. Since I did it in steps, finding typos as I
went along, I actually ran sgit three times but to simplify the above
(and to show that it's possible to do more than one sed command) I made
it all as one. Since I did not have a list of files ahead of time I had
to determine what files to commit, first going through them like:

    for j in $(for i in $(git status|grep modified|cut -d: -f2); do \
	git grep 'https://www.ioccc' "$i"; done|cut -d: -f1|sort|uniq); \
	do git diff "$j"; done|less -r

(I had to pipe through less because of a strange problem with the git
diff which appears to be because of a terminal problem maybe due to the
command above but it was all I could come up with in a very tired head.)

The above and

    git status | grep modified:

showed that some C files had been modified which obviously should not be
done so I had to do:

    git co '*c'

to undo those changes.

Finally to commit the correct files I did:

    for i in $(git status|grep modified|cut -d: -f2); do \
	git grep -E 'https://www.ioccc|https://slashdot|are VERY WELCOME' "$i"; \
	done |cut -d: -f1|sort|uniq|xargs git commit -v

or so (with any formatting issues or typos here due to typos in the log
due to the terminal (in)sanity issue described).

2018/burton2/README.md

@@ -37,7 +37,7 @@ man ./tac.man
 
 ## Judges' remarks:
 
-They say size isn't everything, and in the case of IOCCC [iocccsize.c](http://www.ioccc.org/2018/iocccsize.c)
+They say size isn't everything, and in the case of IOCCC [iocccsize.c](https://www.ioccc.org/2018/iocccsize.c)
 that is saying something!  What is this program weighing and how much does it weigh?
 
 ## Author's remarks:
@@ -167,10 +167,10 @@ determine which tool was correct when there were differences.
 > Nevertheless, the more clearly written code remains a spoiler for this entry.
 
 NB: `iocccsize` gets a different answer from `tac` on its own
-([iocccsize.c]([iocccsize.c](http://www.ioccc.org/2018/iocccsize.c)) source code;
+([iocccsize.c]([iocccsize.c](https://www.ioccc.org/2018/iocccsize.c)) source code;
 `tac` gets the correct answer.  This is due to the aforementioned bugs within `iocccsize`,
 proved by fixing
-[iocccsize.c](http://www.ioccc.org/2018/iocccsize.c) with the included patch, so `iocccsize` reports
+[iocccsize.c](https://www.ioccc.org/2018/iocccsize.c) with the included patch, so `iocccsize` reports
 the correct answer for itself.
 
 ### But wait... There's More!
@@ -293,7 +293,7 @@ sed 's/^# .*$//' | sed 's/^#//' |
 * The code describes its function by careful arrangement of variables up front...
 * ...coupled with a description of the typical IOCCC contestant, or at least the author
 * Why shouldn't trigraph parsing be written in trigraph?
-* Where [iocccsize.c](http://www.ioccc.org/2018/iocccsize.c) mocks, this code flaunts:
+* Where [iocccsize.c](https://www.ioccc.org/2018/iocccsize.c) mocks, this code flaunts:
   "_no matter how well you may think you understand this code, you don't, so don't mess with it. :-)_"
 * `O,0,l,1` are used to confusing effect, local names obscure global names.
 * Globals are used to pass information between routines: don't reorder "unrelated" statements....
@@ -336,7 +336,7 @@ The following reserved word files are included:
 	ioccc.kw.freq   c11 + additional words, sorted on frequency of occurrence in ioccc winners
 
 
-NB: The keyword file used in this code is derived from the list in [iocccsize.c](http://www.ioccc.org/2018/iocccsize.c),
+NB: The keyword file used in this code is derived from the list in [iocccsize.c](https://www.ioccc.org/2018/iocccsize.c),
 which is neither complete (`#define`, `#ifndef`, `#undef` are missing
 -- yes, Virginia knows about `#define` omitted on purpose),
 nor correct (many more are added: `I`, `true`, `bool`, `compl`, ...):