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Move client lib files in their own directory
Rework gpp_cred_handle management
Properly renew expired credentials
Fix most memory leaks
Add a hidden debug tool to gssproxy
Fix formatting on noncompliant copyright lines
Fix leak of mech OID in gssi_inquire_context()
Clarify mech_for_saslname implementation note
Guard against NULL remote credentials
Always shortcircuit mech_invoke to the local mech
Support clients running in AT_SECURE context
Remove no-op consts in return types of helper functions