mod/web-if:
 * don't write the value of [http://www.delorie.com/gnu/docs/bash/bashref_62.html SHLVL] variable to the flash-diff-file, this causes a diff-file to be created even if no option in freetz-web-if has been changed (just click on "Übernehmen" on package configuration page without changing anything to reproduce the bug), this also unnecessarily wastes space in the flash memory
 * use {{{cd /var/tmp/flash; sed -i -re '/export SHLVL/ d' *.diff; rm $(find . -type f -name '*.diff' -size 0); modsave flash}}} to cleanup all diff-files and remove those of them with zero-size


git-svn-id: file:///var/svn/freetz/trunk@12081 149334a1-2f27-0410-a3b9-fc62619ac1e6