git-update-dirs: Use $is_annex to determine if it's a git-annex repo

Create a $is_annex variable to check if the current repo has annex.uuid
defined. This variable can be used in other checks to find out if the
repo is used by git-annex.

0311a5da-c3a4-11e3-aae0-000df06acc56
New commits in Git/gpstools/

a4ba8808-c5c9-11e3-a57e-000df06acc56
wpt-rmsym: New symlink

c21109b8-c5c9-11e3-990e-000df06acc56
poiformat: Add wpt-rmsym

17c626be-c5ce-11e3-aaa6-000df06acc56
Merge branch 'add_wpt-rmsym'

* add_wpt-rmsym:
  poiformat: Add wpt-rmsym
  wpt-rmsym: New symlink
  New commits in Git/gpstools/

f989f2d8-c5ce-11e3-863b-000df06acc56
all-lpar: Remove -f stuff, just pass any arguments to git-update-dirs

Now when the -l option is added to git-update-dirs, things can be
stripped down. Will add some option to git-update-dirs to make this
script unnecessary, but there's some details to considerate first.

30b5bee6-c7e0-11e3-bee3-000df06acc56