[rfc][icedtea-web] cache tweeks

[Jiri Vanek]

releaseLock is bug, found thanx to tweeksToCache work.
releaseLock is releasing the never released lock. It is not 100% fix but for deeper fixing this needs to wait for cache revisite. ntil now it was invisible, because jvm always terminated after clean-cache.

The tweeksToCache is doing the only thing - making clear cache more visible. Righ ntnow it exists only as cmd switch, and as feature in itw-settings->cache->view Fiels->delete on by one.
Now one can itw-settings->cache->view Files->delete all.
Delete all is also presented on error dialogs - with tooltip why.

Motivation? - tired to close bugs by "clear cache first please" "how" "...:x..." "It started to work"

Thanx!
   J.
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