Add params.js so the API version check in package.js works

package.js requires params.js in order to function properly
fix the .desktop file exec line
Makefile.am rename PACKAGE_TARNAME to PACKAGE_NAME
Listview.js, mainWindow.js: fix the lsiview refresh

The listview wasn't resetting the index value when the directory changed, so a new directory enumeration wasn't being triggered.
listview.js: special case startup with no files