Enhancements to nuclear timescale MT, several fixes, addresses issue #1285

[ilyamandel]

See discussion and plots in #1285 .

• The nuclear timescale mass transfer rate is now set by the requirement that the star ends the time step just filling its Roche lobe (addresses issue Misbehaving nuclear timescale mass transfer #1285)
• Fix an issue with the root finder for fitting into the RL that led to artificial failures to find a root
• Fix issue (likely introduced in 03.08.00) with the accretor not gaining mass appropriately

[jeffriley]

All good - thanks @ilyamandel

[ilyamandel]

Thanks, @jeffriley . Given that this has multiple fixes for pretty severe bugs (e.g., the secondary was not accreting when it should have been), I'll go ahead and merge. Folks tagged in this are aware and can comment at their convenience if they wish (also tagging @veome22 , since he will probably want to use v. 3.09.00 for future tests).