ERT_799: Added test and testdata for writing log value to parameters.txt
ERT_799: Added test to CMakeList.txt
ERT_799 and 795:  Printing log value and printing %g instead of %e
ERT-795 and 799: Added method and corresponding test in stringlist
ERT-795 and 799: Added testing of precision
Merge pull request #665 from chflo/ert_795_and_799

Ert 795 and 799