Remove duplicate entry and non-contributor persons from AUTHORS file
(remove entries occasionally leaked from GCC and Mono downstreams;
revert part of commits e1dc74a7, b23e1c8a, 8747eb89)
ChangeLog: Add information about ancient release dates
Added instructions to README.md for building from git.
Update Xerox FTP host name in overview.html

* doc/overview.html: Update FTP host name (ftp.parc.xerox.com).
Fix typo in person name in gc_cpp.h comment

* include/gc_cpp.h: Fix typo in surname (John Ellis) in comment.
Update AUTHORS file (specify email for some more contributors)
Restore contribution information for ancient releases in ChangeLog
(revert part of commit ba8ef9e)
Update AUTHORS file (add more persons mentioned in ChangeLog)
Fix typos in ChangeLog (in items for ancient GC releases)

* ChangeLog: Fix typos ("nonexistent", "to", "posting", "bit rot",
"likely", "flaky").
* ChangeLog: Fix typos in surname (Juan Jose Garcia-Ripoll,
Paolo Molaro, Andreas Tobler).
* ChangeLog: Fix incorrect article ("a finalizable").
gc1.9 tarball import
gc-2.4 tarball import
gc2.6 tarball import
gc3.3 tarball import
gc3.6 tarball import
gc3.7 tarball import
gc4.0 tarball import
Merge tag 'gc4_1' into ancient-releases
gc4.2 tarball import
gc4.3 tarball import
gc4.4 tarball import