GLProfile: Initialization fix and clarifications ( GLExceptions on n/a profiles )

    - Backport of master: 29cc5fa0375026c09bcbfed16627fe9eb6c97846

    - GLProfile.initSingleton(boolean) (implicit or explicit) won't
      throw any exception anymore. Followup 'GLProfile GLProfile.get(..)'
      calls will throw a GLException, if n/a.
      Availability maybe queried via GLProfile.isAvailable(..).

    - GLCapabilties, GLCanvas, GLJPanel: Clarify case where GLException maybe thrown,
      i.e. no default GLProfile available on default device.

    - Remove redundant GLProfile.is<ProfileName>Available(..)

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