Remove useless fiels; update copyright;add keywords to desktop and change the install path; remove Breaks/Replaces; fix spelling errors; update the translation; add libpeony2.symbols

Note that this method is only effected at ukwm or mutter, but not effected in kwin (need fix).

1. advance-search-bar：add setdefaultpath function.
2. use current path as default search path.

1. improve item's text role displaying.
2. fix the warning about setting font size.

1. limit trash operation.
2. improve trash operation error handler.
3. fix the error handler in delete operation.

1. drop sort order option.
2. fix the items displaying problem when changing view icon size.

desktop window: after double click clear current selection.

update debian directory.
update project info.