r>%		'r': read package version information<br>%		'w': create version.ver version file<br>%		'u': update any property of the version file<br>%	PROP: One of the following properties:<br>%		'Name' with VAL (string): Package description<br>%		'Version' with VAL (string): Package version<br>%		'Release' with VAL (string): Older Matlab release compatible with the package<br>%		'Date' with VAL (datenum): Last update of the package<br>%<br>% Outputs:<br>%	pack_info: a structure with package informations.<br>%<br>% 