stared implementing remove
advancment in remove
Patched yaml iterator to return None is tag enswith :none
on the road to remove - handling None values
Merge branch 'master' into remove

merge latest from master
fixed some issues with resolve command
Fixed handling of pre_copy_item when no items to copy to folder.
Added __TARGET_DIR__ var on remove folder loop - still need to add in other loops
Fixed Windows recursive rmdir in PlatformSpecificHelperWin
* improved handling of Null values in resolve_to_list
* target folders in remove sorted in reverse
added help to remove command
    * yaml write will print ~ in case of None value
    * installItem.resolve_inheritance will not get remark from parents
    * interactive mode got do_listindex function to print resolved index items
* New command remove-empty-folders: removes empty folders or folders containing only ignired files.
        List of ignored files are specified in REMOVE_EMPTY_FOLDERS_IGNORE_FILES
 * New defaults file InstlMisc.yaml with definition of REMOVE_EMPTY_FOLDERS_IGNORE_FILES
instl 0.9.15

remove command fully implemented.

Merged from branch 'remove'
instl 0.9.15

remove command fully implemented.

Merged from branch 'remove'