lkairies-volume-quota/interface: Added ENOSPC to POSIX error types.
lkairies-volume-quota/servers: Added getVolumeQuota() method to StorageManager and VolumeInfo.
lkairies-volume-quota/servers: Added quota check to open operation.
lkairies-volume-quota/servers: Added quota to system attributes and re-implemented get- and setVolumeQuota() methods.
lkairies-volume-quota/servers: Extended quota check for quotas equals 0, i.e. no quota is set.
lkairies-volume-quota/tests: Added quota test.
client: Added ENOSPC error conversion to fuse_adapter.
interface: Added quota to Volume message.
servers: Added quota to CreateVolumeOperation.
client: Added quota to createVolume.
client: Added quota to mkfs.xtreemfs.
client: eliminated compiler warning
Added check for clang compiler to Makefile
flease: create test directory before running FleaseStageTest
flease: create test directory before FleaseAcceptorTest and FleaseProposerTest
Merge remote-tracking branch 'origin/master' into plieser-EtE_encryption
plieser-EtE_encryption/client: Moved files for MessageDigest to util/crypto
plieser-EtE_encryption/client: Moved files for MessageDigest to util/crypto
tests: repeat JUnit tests three times before failing
client: Added quota to xtfsutil.