UI fixes and security suggestions

UI reworked to more conforming core.

- removed useless theme function, listing of presets is much cleaner
- edit preset form is reusable
- used drupal_write_record() to unify insert/update
- renamed galleryapi_get_*_names to galleryapi_get_*_options - more intuitive
- presetname should be escaped because it's inputed by user (security!!! all over module - don't use t('!name

- added dedicated permission 'administer galleryapi' because 'administer site configuration is to much

- a bit changed strings to conform security with preset name

PS: sorry for fuzz in patch - there was a lot of trailing spaces