Clean up

[mkraska]

Adjust the code of meclib.js to JS coding standards.

• replace var by let
• class names starting with capital letters
• strict comparisons with ===
• make findConnectingLines() a method of class polygon (instead of a global function)

Change Maxima comments in functions from block comments / / to line comments. This is because nesting of block comments doesn*t work. Local copies of functions with block comments can't be switched on/off with block comments in the question variables.

[mkraska]

replacing var by let done by Aaron in iMeclib