Log Message:
Update to 1.2.20150513:

2015/05/13
	+ add configure option --with-install-prefix, like ncurses.
	+ add --with-screen and related configure options from ncurses-examples
	  to allow building with ncurses6 test-packages.
	+ update configure macros for improved coding style from lynx changes.
	+ updated ro.po from
		http://translationproject.org/latest/dialog/
	+ update config.guess, config.sub
	> patches by Florent Rougon:
	+ fix two bugs in the "--file" option.
	  + When the number of arguments read from the included file is 0, the
	    code used to just skip over '--file' and its argument instead of
	    removing them from the argument list, causing "Error:  Unknown
	    option --file" later on.
	  + In the alternative case (at least one argument read from the file),
	    the previous code used to do '--j;' in order to "force rescan" of
	    the inserted arguments.  However, control then flowed to outer
	    blocks where a '++j;' counteracted this measure, causing "Error:
	    Unknown option --msgbox" (for instance) later on.
	+ modify escaping in argv.c to be more uniform, whether or not the
	  backslash is found within a parameter.