Move predefined constants from NULL to addr of private static, update backends

Remove large stack allocation

Fix occa vector memory management

Replace 'deviceID'/'platformID' with 'device_id'/'platform_id'

Make style

[OCCA] Fix qfunction not shifting output pointers

[OCCA] Replacing series of 'if's with switch

Update Tmpl to use highest priority /cpu/self

[OCCA] Rework switch statement for AllocOpOut and AllocOpIn

Occa: sync to host for passive fields

Occa: copy OperatorApply output to "used" pointer

[OCCA]Add zeroing of outvecs

[NEK][WIP] Convert bp1 and bp3

[MAGMA] Fix OP Setup

Fixed minor MAGMA typo

Documentation and style updates

Copy Ref updates to MAGMA

[MFEM] Convert MFEM bp1 to active passive

[occa] removed Opencl __global in backends/occa/*okl

[occa] qfunctions & operator cleanup

[occa] ex1 test running

[occa] qfunction + okl and fortran __FILE__ (< 72 characters!)

[occa] operator + qfunction alloc

[t20] okl offsets

[active/passive] t20 without operator