create a Workspace2D Implementation

[Nick Draper]

Create a concrete implmentation for a 2D workspace, inheriting from the Workspace class.

This will need to store Neutron counts (double) against time bins and detector number Also the values of the time bins will need to be recorded

Error information will need to be stored in another array.

[Nick Draper]

For this iteration do not worry about any links to sample, environment or detector information

[Nick Draper]

(In [55]) Checked in on behalf of Laurent, refs #23

[Russell Taylor]

(In [56]) Added Histogram1D to makefile. Re #23.

[Laurent Chapon]

(In [58]) refs #23 Still need to fix some bugs that appear at run time Needs to return proper memory footprint as well

[Russell Taylor]

(In [59]) Fixed some paths to header files. Re #23.

[Laurent Chapon]

(In [60]) re #23

[Laurent Chapon]

(In [61]) re #23 Fix bug: shared_ptr of _X, _Y, _E not initialized in constructor Histogram1D

[Laurent Chapon]

(In [62]) re #23 Bug fix Workspace2D::setHistogramNumber(int) did not assign class attribute _nhistogram

[Laurent Chapon]

(In [63]) re #23

[Laurent Chapon]

(In [64]) re #23

[Stuart Campbell]

This ticket has been transferred to github issue ​871