Integrate err model fitting into PVTeval

 - incorporate error model into PVTeval and updatePVTdata
 - add errorModes to getPVTdata_MgPvTange2012
 - add Neon Eos with getEos_NeDewaele2008 and debyeShiftPowerLaw
Add Eos fitting output and fit Tange and Wolf data

 - Add formatTblOutput, writeEosTbl, writePVTdataTbl
 - Add data tables and fit tables corresponding to fits of Tange and
Wolf data
 - Ignore converted markdown ouput in html and pdf files
Add formatValErrStr for nice printing of val/err

 - still needs to be incorporated in table output function
Improve data readin from tables

 - PVT data now read in from nice pipe-delimited markdown tables using
readPVTdataTable
 - loadPVTdata is a convenience function that reads a script storing
metadata information about PVT data
 - Add reduced isotherm plots to fitMgFePv script (not yet automated)