Add new port deskutils/projectlibre

ProjectLibre is an open source project management software. It intends
to be a complete desktop replacement for Microsoft Project. ProjectLibre
is compatible with Microsoft Project 2003, 2007 and 2010 files.

WWW: http://www.projectlibre.org/product/projectlibre-open-source

PR: 214285
Submitted by: Joseph Benden <joe@thrallingpenguin.com>
Reviewed by: danfe