cleanup + cosmetic + more documentation for wget-wrapper,
this includes the following commit from kalua:

user@box:~$ git log --oneline -- openwrt-addons/etc/kalua/wget

d78c8bc kalua: wget: always remove error-files after reading them: read VAR <$file fails when file is 0 byte in size, so we have to change the check - 2/2
8210649 kalua: wget: always remove error-files after reading them: read VAR <$file fails when file is 0 byte in size, so we have to change the check
017c7cc kalua: wget: do() cleanup some coding-style issues
9f64e02 kalua: wget: comment in code
51b0cac kalua: remove some superfluous TAB's 2/2
406400c kalua: remove some superfluous TAB's
a29ec1a kalua: scheduler: remove unneeded old stuff: wget-log-file cleaner, panic_on_oom-enabler
865255b kalua: add shebang to every kalua-class-file, otherwise e.g. syntax-highlightning doesnt work
f4179ab kalua: cron.check_inet_gw: batman: fallback to special mode for getting nexthop if normal way does not work 3/3
20ca2bf kalua: wget: possible bad 'sed' call repaired
abbc7f7 kalua: wget: do() lowering logging
d1b8887 kalua: wget: do() log url-length in bytes