Stats

• Problem statistics
• Profile generation
• Graph simplification
• Tests for the above

assigned to @pmag

added 4 commits

• d4533ddd - Limitations to the number of incoming and outgoing directed arcs are now...
• a429189b - Separated network restrictions from the main model module. Tests work. Started...
• e7a9bcd4 - Module for node prices. Added support for non-convex functions. Added some tests.
• 4fa48ce4 - Added support for non-convex functions.

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mentioned in commit 51dbeaaf

merged