Use QPlainTextEdit for log window rather than QTextEdit

It is only used for plain text and is much more light weight that the
full text edit class.
Refs #7331
refs #8060 Created Muller Ansatz template

with contents equal to Strontium122
refs #8060 should have Ansatz function defined.
refs #8060 intermediate checkout

Ansatz looks more or less reasobable but looking at proper identification for external references
refs #8060 All formally here

The question is how to test all this to be sure it is all right.
refs #8060 Attempt to fix Unix error
refs #8060 Fixing unix warnings.
Added algorithm PoldiPeakSearch

The algorithm is very close to the original fortran program. There are
still some tests/documentation missing.
Added checks for edge cases, completed unit tests
Chose some more clear variable names, added a few comments
Added check for minimum peak separation
Small typos and fix for TIB at CNCS. Refs #9122
refs #8060 should fix bunch of CPP check warnings
Moved comment about background to appropriate location
Fixed off-by-one errors in PoldiPeakSearch, background computation

PoldiPeakSearch now calculates background and sigma and assigns sigma to
the correlation workspace as error.
Added documentation to PoldiPeakSearch
Removed C++11-features from PoldiPeakSearch, corrected unit test
Merge branch 'poldi-peaksearch' into feature/poldi-peaksearch
Removed duplicate from CMake file
Added utility class for Miller indices