* added checkbox to allow user to launch hugin in gui mode
* changed the logic so hugin will write temp files to tmp directory and then move the final result to the directory of original source files. this improves speed when original source files are on network mapped drive
* added some additional error messages
* added preference requiring user to specify the paths for hugin, hugin_executor and pto_gen needed for this plguin
* added preference to allow user to choose to launch hugin in GUI mode
* minor fix to the way files are handled; due to some versions of hugin_executor not writing out to the path specified in --prefix, assume we are working in the tmp directory and then move the file afterwards
* handle stiching all from hugin_executor without the gui
* automatically create the panorama file name based on first selected file plus _pano
* automatically detects if output file exists, if so use an unique name
* delete temporarily exported file
This is for consistency reason as the lib/dtutils/file.lua use this
directory. Also all translation into contrib where not usable as
not checked into this directory which was expected to be just lua.
All in all using locale directory will avoid clutter the main
directory with all possible languages and fixes the current scripts.
- a comment about needing hugin installed
- it's not the lua version that we check, it's the DT API version
- declare "local img_list" here, and avoid having a global variable
