fixed the Izh_sparse project for double precision numbers.
Merge branch 'nrn_var_que' of https://github.com/genn-team/genn into nrn_var_que
Fixed a problem with double constants in Izh_sparse_project.
Fixed a typo in the atomic add for float.
Hopefully fixed the atomic add problems
More fixing on the atmoicAdd issue
Made some conversions of randoma numbers generated from double to scalar explicit.
Fixed a compile problem of HHVClampGA project that was using a unsupported "ensureCompilerEnvironmentCmd() function. This seems to be a hangover from when we tried to figure out windows support on different platforms.
Removed "usertools.h" with the deprecated windows environment tools.
Fixed an omission where HHVClamp project could not find toString
Fixed a problem where definition of UINT32 and UINT64 in isaac_hpp where clashing with existing definitions of this name in windows.
Merge remote-tracking branch 'origin/nrn_var_que' into development