Corrected value of electric conversion factor f in the manual
- As suggested by Christopher Neale
- Made a new latex command for the value so that it can appear
consistently throughout all uses in the .tex manual
- changed the value to f = 138.935 458(9), which is value and
standard deviation calculated from NIST 2010 CODATA, as also
used by GROMACS in units.h (full value calculated from
numbers in units.h is f = 138.935 457 839 ... )
- If I calculated correctly, the pre-June-2015 value of the std-dev
was correct, just the last two digits of the value itself
were swapped in some places 58(9) <-> 85(9)
- I believe commit
1ee3b15530a5 accidentally overwrote the std-dev
with digits from the value itself
Change-Id: I293768b657a81af0a4dc0865db8c4a1b0eebd4ad