tests/test-cat

bash_completion: be more careful about whitespaces

- use awk to parse the output of hg help.
- print one completion candidate per line
- print the debug commands after regular commands
  (this eases the shell side of the parsing)
- don't print aliases that are simple abbreviations
  (e.g. up/update, id/identify)

#!/bin/sh
#
mkdir t
cd t
hg init
echo 0 > a
echo 0 > b
hg ci -A -m m -d "0 0"
hg rm a
hg cat a
sleep 1 # make sure mtime is changed
echo 1 > b
hg ci -m m -d "0 0"
echo 2 > b
hg cat -r 0 a
hg cat -r 0 b
hg cat -r 1 a
hg cat -r 1 b