hgcommand.vim: requirements & doc self-install more consistent; cosmetics
Check for availability of builtin system().
Set 'compatible' while sourcing script.
File operation during doc self-install:
Escape spaces in ex-commands.
Use quotes in system calls.
Incremented revision number(s).
Size of patch is due to cosmetic cleanups:
Removal of spaces at line endings.
<SID>Prefix to functions when called.
#!/bin/sh
mkdir t
cd t
hg init
echo a > a
hg add a
hg commit -m "test" -d "1000000 0"
hg verify
hg parents
hg status
hg rollback
hg verify
hg parents
hg status