added blank theory and glossary section, updated index
updated / reshuffled text between index intro and quick start
updated theory_gloss from old SIMcheck.html
added basic info to developer.rst from SIMcheck README
added SI systems section
added Quick Start info from SIMcheck.html
added cal_checks info from SIMcheck.html
added utils info from SIMcheck.html
fixed developer.rst formatting a little
added raw_data_checks info from SIMcheck.html
added SIR_data_checks info from SIMcheck.html