perl 4.0 patch 10: (combined patch)

perl 4.0 patch 10:  (combined patch)

Subject: pack(hh,1) dumped core
Subject: read didn't work from character special files open for writing
Subject: close-on-exec wrongly set on system file descriptors
Subject: //g only worked first time through
Subject: perl -v printed incorrect copyright notice
Subject: certain pattern optimizations were botched
Subject: documented some newer features in addenda
Subject: $) and $| incorrectly handled in run-time patterns
Subject: added tests for case-insensitive regular expressions
Subject: m'$foo' now treats string as single quoted