Add `grml_theme_has_token' guard function

Signed-off-by: Frank Terbeck <ft@grml.org>
grmlzshrc(5): Briefly mention `grml_theme_has_token()'
grmlzshrc(5): Mentioned the wrong function; actually: grml_theme_add_token()
zshrc: use "ctrl-x ." instead ",." to enable power completion / abbreviation expansion

The use of ",." for enabling the power completion /
abbreviation expansion / buffer expansion was a bad idea
because you'll get either a delay or even missing characters,
e.g. when ",." is part of a copy/paste action. So switch to
a safer approach by using "ctrl-x ." instead.
Release new version 0.9.0
iscygwin関数を追加
cygwinの場合エラーになるので、stack制限をしない
cygwinの場合、TZを設定しない