[template] Move templates/zlogin to login_init.zsh

so it's not a template anymore and can be under version control, instead
of being manually updated by the user, as currently is the case with
`~/.zlogin` and `${ZIM_HOME}/templates/zlogin`.

Closes #218

tools/zim_build_cache

@@ -2,4 +2,6 @@
 # zim_build_cache - rebuilds the zim cache
 #
 
-source ${ZIM_HOME}/templates/zlogin
+source ${ZIM_HOME}/login_init.zsh
+
+print 'To rebuild the completion cache, please restart your terminal'

tools/zim_clean_cache

@@ -5,5 +5,3 @@
 find ${ZIM_HOME} \( -name '*.zwc' -or -name '*.zwc.old' \) -delete
 rm -f ${ZDOTDIR:-${HOME}}/.zshrc.zwc{,.old}
 rm -f ${ZDOTDIR:-${HOME}}/${zcompdump_file:-.zcompdump}{,.zwc{,.old}}
-
-print 'To rebuild the completion cache, please restart your terminal'