Handle non-chronological results

[GordStephen]

Results that report non-chronological time periods (most notably MT blocks) currently break the solution processor. First noted by @craigl33.

• Immediate workaround is to not save out MT/PASA properties from PLEXOS
• Short term fix would be for the package to just ignore those timescales (instead of crashing)
• Long term fix would be for the package to store them properly (how important is this in practice?)

[bethanyfrew]

Removing the MT/PASA properties from the PLEXOS outputs provided a viable work-around for some tests Daniel Levie and I did (using v.7.4 on eagle).