handcalcs bug fixes

Thank you to @michaellisitsa who for posting issues for handcalcs recently. This release fixes the following:

• Additional spaces around commas when used as decimal separators has now been removed
• A bug involving white space underneath %%render params causing the alignment to be affected has been fixed (#52)
• Inconsistencies with some parentheses around deeply nested calculations that start with function names have been fixed (#49)
• Parentheses fully enclosing a calculation was not creating a "parameter line" (no substitution); this is now fixed (#51)
• A bug involving complex numbers being inappropriately rendered in scientific notation

Additionally, if anyone is using handcalcs in school or in their daily life, I have created issue #50 as a place people can showcase their rendered notebooks. I love seeing handcalcs being used so if you have something you would like to show off, please submit!