add assert()s when dereferencing pointers.
Powiter crashes in loadOFXPlugins() when loading F_Furnace.ofx.bundle or Denoise.ofx.bundle, which expects a Nuke host:
Host has OpenGL render support: (null) (stat=3)
Caught OFX::Exception::HostInadequate OfxMessageSuite
load failed on plugin uk.co.thefoundry.noisetools.denoise
Caught OFX::Exception::HostInadequate OfxMessageSuite
load failed on plugin uk.co.thefoundry.furnace.f_align
Caught OFX::Exception::HostInadequate OfxMessageSuite
load failed on plugin uk.co.thefoundry.furnace.f_deflicker2
Caught OFX::Exception::HostInadequate OfxMessageSuite
load failed on plugin uk.co.thefoundry.furnace.f_degrain
Caught OFX::Exception::HostInadequate OfxMessageSuite
load failed on plugin uk.co.thefoundry.furnace.f_denoise
Caught OFX::Exception::HostInadequate OfxMessageSuite
load failed on plugin uk.co.thefoundry.furnace.f_kronos
Caught OFX::Exception::HostInadequate OfxMessageSuite
load failed on plugin uk.co.thefoundry.furnace.f_matchgrade
Caught OFX::Exception::HostInadequate OfxMessageSuite
load failed on plugin uk.co.thefoundry.furnace.f_motionblur
Caught OFX::Exception::HostInadequate OfxMessageSuite
load failed on plugin uk.co.thefoundry.furnace.f_regrain
Caught OFX::Exception::HostInadequate OfxMessageSuite
load failed on plugin uk.co.thefoundry.furnace.f_rigremoval
Caught OFX::Exception::HostInadequate OfxMessageSuite
Caught OFX::Exception::HostInadequate OfxMessageSuite
load failed on plugin uk.co.thefoundry.furnace.f_vectorgenerator
Caught OFX::Exception::HostInadequate OfxMessageSuite
load failed on plugin uk.co.thefoundry.furnace.f_wireremoval