[patch] improved ignore pattern matching (#57637)

[Kent Gibson]

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Attached is the bundle of my latest patch.

Notable changes:
  - made matcher more fnmatch compatible - '*' now matches leading '.'.
  - Support '**' pattern as per zsh (only works as a whole path
component else behaves as per '*')


My branch with these changes is available at
https://launchpad.net/people/warthog618/+branch/bzr/lp57637

There is also a revision in that branch that supports case-insensitive
matches on case-insensitive platforms (in r2137), but I reverted it in
response to Jan's recent email (in r2139 and r2140).  Take your pick.

I'm thinking the ignore patterns probably deserve a help topic of
their own, but I'm more interested in getting the core code out there
at the moment.  Hopefully the ignore help is sufficient in the meantime.

Cheers,
Kent.
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