CODE resize small optimizations to sizeTreeToggle
FIX #68 : Add step modifiers to size spinboxes

Normal 10x
Hold shift 1x
Hold Shift+Alt 100x

Another possibility could be to hold Control to cicle trough pre-
defined sizes.
FIX #54 : set ratio based on wxh contents.

Small GUI improvements on ratio and wxh
ADD internationalization markers
Migration to translation support
ADD: default.pot and spanish draft translation
MINOR code organization
FIX #64 : Remember window position and size.
CODE optimization: String map substitution functions
CODE optim: setDictEntries and getOraKraSize
CODE, small optimization in setUserPresets
CODE optim: getFilesTotal, putsHandlers
FIX && CODE optimization: listValidate no longer uses update

Script is super responsive while loading files.
FIX: indetify hangs on xml and mp4 files, so feeding artscript
with any of those files hangs forever. To avoid this, we no longer
trust the supplied data and ignore any extension not in extension list
or files with no extension
i8N : Added missing strings to translatable
FIX: All code use identifyFile proc for identify calls
FIX: Open folder reset if cancel pressed. +Thumbnail

Thumbnail small code optimization
CODE optim: removed func "loadTreeFiles", updatefunc indorporated
to listvalidate

Added mc strings to source code
DRAFT: code for artscript dirs changing depending on platform
FIX: add thumbnail dirs to artscript dirs, create folders if they
do not exist.

Also small fixes introduced during i8n
Merge branch 'master' into dev