Save numbers in {:g} format not {!r} format in prettify function.

The prettify function, originally part of cantherm (3f7c71baa2c07d6bd21aadde853a487dddf503b7)
is used to save entries in the database. It turns all numbers into repr(number),
even if you had previously tried to save them as something else.
Now, it uses {:g} formatting, so instead of 
 A = (3600000000000000.0, 'cm^3/(mol*s)')
we now get
 A = (3.6e+15, 'cm^3/(mol*s)')

This will have broad-ranging impacts on file output - I hope they are all positive.
If not, we will have to make it configurable on a case-by-case basis somehow.
Update RMG example 1,3-hexadiene with multiplicity label
Update RMG example c3h4 with multiplicity label
Update RMG example ch3no2 with multiplicity label
Update RMG example diesel with multiplicity label
Update RMG example e85 with multiplicity label
Update RMG example liquid_phase with multiplicity label
Update RMG example methylformate with multiplicity label
Update RMG example minimal with multiplicity label
Update RMG example minimal_sensitivity with multiplicity label
Update RMG example TEOS with multiplicity label
Add multiplicity label to loadEntry for transport libraries
Add multiplicity label to loadEntry for thermo libraries and groups
Add multiplicity label to loadEntry for statmech depository
Add multiplicity label to class Entry and loadEntry for forbidden
structures
Add multiplicity label to loadEntry for kinetics depository
Add multiplicity label to loadEntry for kinetic groups
Add multiplicity label in loadEntry for kinetic libraries
Add multiplicity label to group.py

- remove multiplicity from GroupAtom
- add multiplicity to Group
- update __gainRadical() and __loseRadical()
- update equivalent() and isSpecificCaseOf()
Add printMultiplicity=True to toAdjacencyList() in
saveSpeciesDictionary()