Allow property values to be changed at runtime

[Martyn Gigg]

Cache properties read from the properties files so that they can be changed at run time. Before shutdown, update the user properties with those values that have changed.

[Martyn Gigg]

(In [4492]) Allow property values within the ConfigService to be changed at run time. Added a function to save the current configuration to a file. Re #1248

[Martyn Gigg]

(In [4493]) Fix ConfigService test. Linux/MAC are more forgiving about opening a file that is still open. Re #1248

[Martyn Gigg]

(In [4496]) Correction to ConfigService test so that if a test fails and leaves a file, the next run of the test removes the file before starting the test. Re #1248

[Martyn Gigg]

(In [4498]) Update to ConfigService instrument prefix warnings. Also cleared some doxygen warnings. Re #1248

[Martyn Gigg]

(In [4499]) Add a Mantid page to the config dialog. Currently only contains facility and instrument prefix options. Re #1248

[Martyn Gigg]

(In [4571]) Fix for Windows when ConfigService saving causes a crash if it encounters a blank line in the original file. Re #1248

[Martyn Gigg]

(In [4598]) Fix for problems with saving property files that contain line continuation characters. Also added a test for this. Re #1248.

[Martyn Gigg]

(In [4602]) Changes to Excitations interface to allow running across MERLIN, MAPS and MARI. Re #1248

[Martyn Gigg]

(In [4628]) Improved handling of default instrument prefixes. Updated Homer interface to use the list of instruments provided by the ConfigService and implemented a check for instruments that don't have a parameter file and hence won't run with the interface. Re #1248

[Martyn Gigg]

(In [4629]) Fix for MantidPlot build. Re #1248

[Stuart Campbell]

This ticket has been transferred to github issue ​2095