The definitions, along with the shared_ptr variants have been moved
to a fwd declare header.
Refs #14599

Refs #14599

This reverts commit 8e55e36c.

Mainly removed Poco includes and used forward declarations instead.
Unsuprisingly this has affected some algorithms.
Refs #8784

to algorithm base classes.
Refs #4218

Also some const-correctness.

Setting them as parents causes issues with the workspace locking
and really isn't the right thing to do.

API side and also refs #4787 added to LoadLiveData

Forgot the IAlgorithm and AlgorithmProxy changes - included now

Refs #3157 Sort our System.h. It was becoming a dumping ground. It should only be touched when absolutely necessary as it affects every file in Mantid. Also combined this with Refs #2345 to sort out DLLExport/DLLImport usage. It's done for Kernel, Geometry and API but stuff in the plugins could do with updating as well.

Refs #2987. Fix issues with some code I wrote a while a go that shows up as a a warning on the Mac. Also cleaned up another prevalent warning from IMDGeometry.

Refs #3026:  Added a field for Wiki description to Algorithm. Made WikiMaker use it to generate wiki pages.

Initial version - you can specify aliases as a comma separated list.  The default is a blank string. refs #2823

Refs #2635. Algorithms can now stringize themselves and also construct themselves from a string. The format is AlgorithmName[.v](prop1=val1,prop2=val2,...), where the .v is optional and determines the version. Added convenience methods on the property manager to stringize itself as well.  

Changes to Algorithm to allow subAlgorithms to be cancelled.

Now algorithms: 
Maintain a vector of weak pointers to any subalgorithms they create. Weak pointers will not prevent the algorithms from being destructed. 
On receiving a cancel command will pass it on to any valid sub algorithms. 
Delete the list of weak pointers when the algorithm is destroyed. As they are weak pointers they have no effect of the lifetime of and subalgorithms.