Convert trapdoor to being a perl file that uses builtin crypt(), and
fix pretty much everything that treated it specially. We now no longer
depend on gcc or anything else. Also fixes by consequence bug 263242,
How about if trapdoor didn't SEGV with no arguments? which caused me
much embarassment this week. r=cls.
* Do not encode / in url_quote
* Do not install old/unused perl scripts
* Update README
* Replace system(rm/mkdir) calls with standard perl modules
* Use url_quote to quote filenames when passing files between cgis
* Use shell_escape on filenames that are passed to system calls via open()
Bug #44642 r=timeless