Refs #9059

Replace <istream> with <iosfwd>
Remove unneeded <fstream>

Refs #9049

Moved a few inlined functions over to the .cpp file which let me replace
two more #includes with forward declarations.

Also moved 2 member variable initializations out of the constructor's
body and into the constructor initialization list.

Refs #9049

Make sure the resources allocated by the Poco XML parsing are released.
This is achieved by making sure release() is called on the object returned
by getElementsByTagName(). Poco::AutoPtr does this on its destruction.

Refs #7994

I think the previous hack almost worked - looks like it fixed the
problem for one cpp file anyway.  Moving my hack over to the header file
that both RemoteJobManager and FacilityInfo include...

Refs #7769

Refs #7769

Refs #7769

It looks like the Poco headers are trying to include both winsock.h and
winsock2.h (possibly because windows.h includes winsock.h by default).
Even if this works (and I won't know until I push it into the develop
branch), it's still a lousy solution.

Refs #7769

Couple of minor changes to make POST requests work properly:
1) Need a blank line before the start of the data in multi-part mime
data
2) Separate file data from other data (by using a second PostDataMap
reference) because it needs to be handled a little differently in the
mime encoding

Refs #7769

Updated StartRemoteTransaction and StopRemoteTransaction to use the new
web API.  Also updated the cookie handling code in RemoteJobManager

Refs #7769

First changes to support the new web api:
- RemoteJobManager hierachy has been collapsed into a single (and much
  simpler) class that now lives in MantidKernel
- RemoteJobManagerFactory is gone (no longer needed)
- Added a new 'Authenticate' algorithm
- Disabled the other remote algorithms because they haven't been updated
  yet.

Refs #7769