+ supports subkey uses other separators, and you can change the default
keys separator now
+ [codec] escapeString(aString, aUnSafeChars = SUBKEY_SEPS+"%") and
unescapeString(aString) functions
+ [codec] SUBKEY_SEPS property can be get/set now.
* [shell.js] remove stupid speedup thing via start, the gte will set the
* start too after reading the leveldown source.
+ unit test and apply changes.