Make HardLinkMaker and FastHardLinkMaker fall back to regular copies if creating a hardlink is not supported.

SVN: 24112

SVN: 24110

Add a method that allows to specify a mode flag which says what to do when a target already exists.
Unify behavior of the methods copyXXXImmutably() without that flag: always return an error status when a target exists.

SVN: 24106

move: AbstractFileSystemTestCase from common.filesystem to base.tests

SVN: 10365

SVN: 10364

SVN: 10355

add: new Unix system calls

SVN: 9138

change: move file system related classes from ch.systemsx.cisd.common.utilities to ch.systemsx.cisd.common.filesystem

SVN: 7906

- fine-grained activity in MonitoringProxy
- logging in ConcurrencyUtilities
- list*() methods to FileUtilities
[LMS-472] Solve performance problem of BDS dataset creation and process triggering on trunk
merged from branch 8.04.x, improvements for 8.04.3 common

SVN: 7800

change: move FileLinkUtilities to common.filesystem

SVN: 7330

SVN: 7076