Nyall Dawson 0f963dfadf [processing] Default to supporting non-file based outputs for providers
And make this support opt-out, since the vast majority of providers
are based on QGIS API and don't have external dependencies which would
restrict use of memory layers/etc.

Plus, I'd rather see non-compliant providers expose this support when
they can't use non-file-based-outputs (and make this the bug which
needs fixing) then have to rely on plugin providers to discover and
explicitly expose this support.
2018-01-29 13:14:06 +10:00
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