Merge branch '1.7.7' into develop

Conflicts:
	commons/src/main/java/com/orientechnologies/common/io/OFileUtils.java
	core/src/main/java/com/orientechnologies/orient/core/config/OGlobalConfiguration.java
	core/src/main/java/com/orientechnologies/orient/core/storage/impl/local/paginated/OLocalPaginatedStorage.java
	core/src/main/java/com/orientechnologies/orient/core/storage/impl/local/paginated/OPaginatedCluster.java
	core/src/main/java/com/orientechnologies/orient/core/storage/impl/local/paginated/wal/OWriteAheadLog.java
	distributed/config/orientdb-dserver-config.xml
	distributed/src/test/resources/orientdb-dserver-config-0.xml
	distributed/src/test/resources/orientdb-dserver-config-1.xml
	distributed/src/test/resources/orientdb-dserver-config-2.xml
	distributed/src/test/resources/sharded-dserver-config-0.xml
	distributed/src/test/resources/sharded-dserver-config-1.xml
	distributed/src/test/resources/sharded-dserver-config-2.xml