Add mq config to .hgrc.

Keepchanges makes --keep-changes implicit (a godsend because I regularly
shuffle through the queue with a dirty tree).

Secret assigns mq patches a phase of secret, which flags them not to be
shared, basically (so ignored by push and outgoing, I think). This is
useful because you never want to push mq patches (I don't even think
that hg will let you by default, but instead of ignoring them it just
fails; ignoring them should be more useful).
Add flog alias that does a non-graphlog log.

I guess at some point I needed this for something...
Add Vim hint to hgrc to set textwidth=0.

Useful for extremely long config lines (I'm not sure if you can wrap hgrc
lines, but apparently I think not since I'm not doing it...).
Enable extdiff Mercurial extension.

It doesn't seem overly useful, but I prefer to have it enabled so it's
there if I want it.
Disable mouse in gVim. Mice are annoying...
Execute zz (center cursor) after diff operations.

,, undoes the current diff line (keep or delete). ,. marks the currently
kept line for removal. By centering the cursor after each it allows you
to always see context for the patch as you work.
Remove space from VBScript SQL helper command.

I'm not sure if this is desirable or not, but it is what I have been
using at j0rb (which is the only time I edit VBScript code..). The
indentation should rightly be 4 spaces, but 3 spaces seems to work or
align better or something... I don't know... I think that 3 spaces is
what you get if you just hit tab due to the fixed depth of indentation
in Vim, so using 3 spaces for these commands means that I get the same
result whether I type by hand or use these shortcuts.. Or something.
h4x.