Change grad function name to "grad", not "prime"

Change y**2 test to y**3

add missing import

[WIP] Adding GpuJoin.c_code to cuda/basic_ops.py

doc: fix typo

Doc

Crash gpu reduce 1111

doc/library/tensor/basic.txt: add alloc() to the list of ways of creating a tensor

Fix error reporting

Split file

Update documentation that was pointing to deprecated or removed function...

Cleanup

Fix SharedVar.value property.

reported by Drew Duncan

fix gh-1474