Corrections to the input file writing.

The solvation writing was just not indented.

There is a default value for the `sensitivityThreshold`,
so if would still print to the input file when `sensitivity`
was not specified. Caused some issues with the website
input file writing.
QMTP input file writing

Also allows the website input file writer to write
the QMTP block.
Solvation input file writing
Write a liquid reactor if solvent is present

Currently we write `simpleReactor` for everything. Liquid
phase systems need to be run with the 'liquidReactor`
module.
Merge pull request #227 from pierrelb/inputFileWriter

Looks good to me and Connie