Time limit not compliant with MOI interface

[hlefebvr]

Hello,

The HiGHS solver currently compares the time limit with the global run time, i.e., the cumulative run time of all runs with a given HiGHS object.

This is to be changed in version 2.0 as indicated in this HiGHS issue.

In the meantime, this makes HiGHS.jl violating the MOI interface specifications and preventing interchangeability of solvers within the JuMP environment.

An easy fix (until version 2.0 release) is to set the time limit to "getRunTime() + time_limit" where "time_limit" is the actual time limit, instead of "time_limit".

Thank you.

[odow]

This is fixed with HiGHS v1.6:

HiGHS.jl/src/MOI_wrapper.jl

Lines 1817 to 1820 in fa6247b

	if Highs_versionMajor() == 1 && Highs_versionMinor() >= 6
	# Not available in earlier versions
	ret = Highs_zeroAllClocks(model)
	_check_ret(ret)

[odow]

See also #125, #162

[hlefebvr]

Thanks a lot!