Handle exceptions in do_hgweb: Send "Internal Server Error", log traceback

various doc fixes - update can no longer be used to merge - short summary start with lowercase - add merge to short help list - fix tests

catch socket.error fix issue394

fix handling of multiple Content-type headers This can happen if an error happens while sending application/mercurial-0.1 content. The error page will be sent resulting (for at least lighttpd) in the following headers: Content-type: application/mercurial-0.1 Content-type: text/html which result in req.proto = 'application/mercurial-0.1, text/html' fix issue344

add [diff] section to hgrc documentation

inst.reason isn't alway in the form (errno, strerror) urllib2.urlopen("foobar://foo") is an example where inst.reason is a string fix issue383

fix hg help <ext> for extension that do not define any command solve issue462

mq: fix strip failing to unlink a bundle os.unlink doesn't know how to deal with urls

symlinks: minimal support for symlinks in merge/update This will get angry, confused, and sad if you try to merge a symlink with a regular file.

symlinks: add flags param to wwrite Now wwrite can set symlink and exec for files

replace filehandle version of wwrite with wwritedata

unify encode/decode filter routines

symlinks: add _link checking function

symlinks: use is_link wherever is_exec is used

symlinks: don't complain about symlinks

symlinks: add a linkfunc

symlinks: add basic symlink functions to util.py

symlinks: check whether a filesystem supports symlinks

exec: remove last flag from is_exec

exec: add execfunc to simplify exec flag support on non-exec filesystems

pull umask-checking up

exec: checkexec checks whether filesystem supports exec flags

expanded bash_completion for transplant extension

Yield entries from [paths], too, when completing -R/--repository.