#133 Time Management - Time overview

[Tomas Budin]

This patch adds a feature to show time overview of dates specified in nodes attributes. It is accessible from Tools -> Show Time

List Based on Attributes.

It uses TimeList dialog and shows one row for every attribute with valid date. The search for date attributes starts from

currently selected node(s) in map.

Recognised date formats:
dd[./-]mm[./-]yyyy
mm[./-]dd[./-]yyyy
yyyy[./-]MM[./-]dd
yyyy

[./-] means that the separator between date parts can be . / or -

[Tomas Budin]