Add Molar Masses to Constants (with a patch)

[Former user]

Originally reported on Google Code with ID 336

What steps will reproduce the problem?
None, this is a limitation.

What is the expected output? What do you see instead?
The capability to use Molar Masses from the constants

What version of the product are you using? On what operating system?
Current Stable.  Windows and Linux.

Please provide any additional information below.
I brought this up under the discussions and left a patch there but nothing 
happened after that post so I'll add the patch here.
I figure this will be plenty useful to have constants available for all 
known molar masses.

Reported by 0Zachariah0 on 2010-04-08 14:30:03

<hr> * Attachment: addMolarMasses-000.patch

[Former user]

``` Thanks, I'll take care of that once I have the time. ```

Reported by `helder.pereira.correia` on 2010-04-08 17:47:51 - Status changed: `Accepted` - Labels added: Milestone-0.11

[Former user]

``` Fixed in commit c1ea1406d7db8d815327c21b56d9d43496e9117d. Sorry for taking such a long time... Would you mind providing me your name so that I can add you to the credits? Thanks ```

Reported by `helder.pereira.correia` on 2011-12-04 03:31:03 - Status changed: `Fixed` - Labels added: Type-Enhancement, OpSys-All, Priority-Medium