Build IArchiveSearch, FileFinder and Data.ISIS implementation

[Nick Draper]

Build the following classes to allow Mantid to search facilities archives.

1. The API::IArchiveSearch interface - this is an imterface that will support all of the searching of archives for files in a generic way
2. The DataHandling::ISISDataArchive implementation of the above interface, this should use the Data.ISIS web calls to find the path.

   http://data.isis.rl.ac.uk/where.py/windir?name=hrpd273 
   to get the full path to the windows network directory
   
   If there is a problem the string returned starts with   “ERROR:”
   
   There is also a linux option 
   http://data.isis.rl.ac.uk/where.py/unixdir?name=hrpd273
   

3. An API::FileFinder class that uses the IArchiveSearch to find one or more files and work out their full paths.

This should use data from the facilities.xml file (see other ticket) to work out the full file name.

[Roman Tolchenov]

(In [5365]) Added FileFinder class. re #1393

[Roman Tolchenov]

(In [5376]) Added IArchiveSearch interface and its ISISDataArchive implementation. re #1393

[Roman Tolchenov]

(In [5378]) Included the archive search service into finding files. re #1393

[Roman Tolchenov]

(In [5380]) Attempt to fix the mac build. re #1393

[Russell Taylor]

(In [5384]) Make sure local settings get picked up in DataHandling build. Re #1393.

[Roman Tolchenov]

(In [5456]) Use <archive> xml element to define an archive searching interface. Switch on/off archive searching from mantidplot preferences. re #1393

[Martyn Gigg]

Verified working in #5882

[Stuart Campbell]

This ticket has been transferred to github issue ​2240