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Apparently, in some cases not having this timeout set can lead the test to fail due to the large body being POSTed.

This change is done since the rebadge did not provide sufficient value, as
rebadged errors are already recognizable enough on their own.

Made temporary directory path configurable, to deal with fact that default is not writeable on android.

test: parsing of requestor schemes and presence of authenticated requestor information during sessions

feat: revert to earlier irma_configuration structure without issuer_schemes and requestor_schemes subdirectories

The requirement that the directory name in which a scheme is stored equals the scheme name is also dropped.

- All code related to schemes has been moved to schemes.go.
- Code that is specific to a scheme type has been converted to methods on
  the relevant scheme struct, which both implement the new scheme interface.
- Code that is the same for both scheme types (downloading, updating, installing,
  parsing the index, verifying signature, reading timestamp) remain methods on
  irma.Configuration, which invoke methods on the new scheme interface when
  necessary.

fix: use forks of cobra, viper, pflag so that depending packages don't require 'replace' directives in their go.mod

feat: in combined issuance-disclosure sessions, don't include credential suggestions for credentials being issued