#7 DBDirect generated code may need -fcontext-stackXX

[Bjorn Bringert]

When compiling DbDirect-generated code for tables with
many columns, GHC may need the -fcontext-stackXX flag,
where XX needs to be at least around the number of
columns in the largest table. Chucky tried to fix this
by adding it as an OPTIONS pragma at the top of every
generated file, but it turns out this is not currently
supported by GHC. The code remains in case the GHC team
starts to support it.