Change references of 'EMail' to '[Ee]mail'

Depending on if it was the beginning of the sentence the EMail would
become 'Email' or 'email'.

Some references of 'Email' were changed to 'email' as well as those were
not in the beginning of a sentence.

A few places some consistency of capitalised email address (made lower
case) were changed to match other places of the same pattern.

2001/guidelines

@@ -396,7 +396,7 @@ ENTRY FORMAT:
     the entry against the size rules.
 
     If you have any suggestions, comments, fixes or complaints about
-    the mkentry.c program, please send EMail to the judges.  (see below)
+    the mkentry.c program, please send an email to the judges.  (see below)
 
     The following is a sample entry (the change bars are not part
     of the example, don't add them to your entry!)
@@ -615,12 +615,12 @@ end
     format may be ignored.  That is, don't place text outside of the
     entry and expect us to see it.  (Our decoding tools are not AI
     progs!) If you need tell the judges something, put it in the
-    ---remark--- section, or send a EMail to:
+    ---remark--- section, or send an email to:
 
 	questions@ioccc.org	(not the address for submitting entries)
 									       |
     You must include the words 'ioccc question'	in the subject of your         |
-    EMail message when sending EMail to the judges.			       |
+    email when sending email to the judges.			       |
 
     The date should be given with respect to UTC.  (Some systems refer
     to this as GMT or GMT0)  The format of the date should be that as
@@ -656,7 +656,7 @@ JUDGING PROCESS:
     Entries are judged by Leonid A. Broukhis, Simon Cooper, Landon Curt Noll
     and Peter Seebach.
 
-    Entries are unpacked into individual directories.  The EMail message
+    Entries are unpacked into individual directories.  The email
     is unpacked into individual files, each containing:
 
 	---entry--- section
@@ -664,7 +664,7 @@ JUDGING PROCESS:
 	all ---info--- sections
 	---build--- section
 	---program--- section
-	any other text, including the EMail message headers
+	any other text, including the email headers
 
     Prior to judging, the 'any other text' file is scanned to be sure
     it does not contain useful information (or in case the entry was
@@ -686,7 +686,7 @@ JUDGING PROCESS:
     we do indicate the volume of paper consumed when presenting the IOCCC
     winners at talks)
 
-    After the initial announcement, we attempt to send EMail to the
+    After the initial announcement, we attempt to send an email to the
     authors of the winning entries.  One reason we do this is to give
     the authors a chance to comment on the way we have presented their
     entry.  They are given the chance to correct mistakes and typos.  We
@@ -814,12 +814,12 @@ ANNOUNCEMENT OF WINNERS:
 
 FOR MORE INFORMATION:
 
-    You may contact the judges by sending EMail to the following address:
+    You may contact the judges by sending an email to the following address:
 
 	questions@ioccc.org	(not the address for submitting entries)
 
     You must include the words 'ioccc question'	in the subject of your         |
-    EMail message when sending EMail to the judges.			       |
+    email when sending email to the judges.			       |
 									       |
     Questions and comments about the contest are welcome.  Comments about
     confusing rules and guidelines are also welcome.