Parsing of Xpress' primal bounds history incomplete

[rschwarz]

It seems that Xpress changed some of the texts in the logging output.

Here is a log line that was detected by the current parsing code:

 *** Solution found:     1.000000   Time:   0.02    Heuristic: A ***

There is code to parse a slightly different line:

ipet/ipet/parsing/Solver.py

Lines 895 to 896 in dbdb0f5

	elif line.startswith(" \*\*\* Heuristic solution found: "):
	self.readBoundAndTime(line, -4, -2)

I was able to fix this by adding yet another case:

        elif line.startswith(r" *** Solution found: "):
            self.readBoundAndTime(line, 3, 5)

[GregorCH]

This, on the other hand, is far easier for me to change than Gurobi logs :)