Fix synchdmlc dimension check and medium bugs

[blakewalters]

Fix #441 and #442: Fixes to SYNCHDMLC

1. Change restriction on width of bottom of support rail (W_railbot) for
   quarter and half target leaves from W_railbot >= W_tip + W_groove to
   W_railbot <= W_tip + W_groove in accordance with TrueBeam
   specs. Accompanying changes to the BEAMnrc and the GUI.
2. Fix bug in full leaf in which much of the leaf cross section
   was left filled with air instead of actual leaf medium.

[blakewalters]

Not quite sure why branch fix-call_vcusource_w_zsrcdum is also included with this, but there you have it.

[deryayucel]

Sorry but on which file should I change these? I do not want to make a mistake and if you could tell the exact path, I would be glad.

[rtownson]

@deryayucel I recommend waiting until this is at least merged into the develop branch and keeping that up to date using git. If you really want this fix now though, you could use git checkout for this pull request (google how to do that). Or just look in the Files changed tab above to see the changes and full file paths.

[deryayucel]

@rtownson I am studying on HDMLC and this error forced me to write wrong data to start run. So, if I could do it, it would be better. But do you think it is risky to do it because it is not tested yet? I am not an expert and your opinion matters to me.

[deryayucel]

@rtownson I checked Files Changed tab but there are many files which are to be changed. All of them are necessary to fix this? Or each one changes something else and I need only one of them?

[rtownson]

@deryayucel I'm not sure these changes fix the error you reported on g+. I submitted that bug as issue #459.

I recommend waiting a couple weeks for these fixes to get merged into develop. If you can't wait, make sure to use git for any checkouts so that you can stay on top of changes.

[blakewalters]

Hi @deryayucel and @rtownson: Most of these changes are for the GUI and documentation. If you just want to run with the corrected restriction on W_railbot and fixed FULL leaves, just apply the changes to the SYNCHDMLC_cm.mortran file.

[ojalaj]

Does FULL leaf now allow the geometry of both types of full leaf in Varian HDMLC (#1/target and #60/isocenter)? Even if it would, the point is that since their geometries are different, they can't be included in the input file simultaneously.

[blakewalters]

@ojalaj, the FULL leaf is intended to model the FULL type leaf in the VMLC (ie not the HDMLC). There are no designated cross-sections for the OUTBOARD LEAVES #1 and #60. In cases where including these leaves is important, my understanding is that people approximate them using FULL leaves.

[rtownson]

@blakewalters from what I understand @ojalaj has the designated cross sections for the #1 and #60 outboard leaves. Is it possible that he has different specs? We can address this in a separate issue perhaps.