6813 src-client/MachineDebuggerImpl.cpp + various formatting changes

6813 stage 7 VirtualBoxImpl.cpp etc

Main: Fixed bug preventing exporting ISOs/DMGs larger than 4GB on 32-bit hosts. Cleaned up the TAR write backend.

Main: Working on reducing RTTar to a write-only interface. Not there yet, though.

Corrected misleading helper function names: s/ShaReadBuf/readFileIntoBuffer/, s/ShaWriteBuf/writeBufferToFile/

ApplianceImplImport.cpp,ApplianceImplIO.cpp: Logging, tiny memory leaks, readability.

Main: Whitespace (including tabs!) and svn:keywords cleanups by scm.

pr6022. Additional checks during OVA/OVF import. Deleting temporary files. Using small memory buffer for copying ISO images with simultaneously calculating SHA digest.

pr6022. 3rd variant (using VFS streaming feature) of GZIP support for reading the gzipped storage images from OVA/OVF package has been added.

Backed out r87679: Still working on the wrong solution... Sigh.

pr6022. Second variant of support GZIP files for OVA appliance.

This is how I meant you should do decompression.

pr6022. cleaning up the code. RTZip interface (Runtime/common/zip/zip.cpp) is untouched. All moved to ApplianceImplIO.cpp.

pr6022. OVA appliance don't fail when a certificate file exists. GZIP support has been implemented (first version).

pr6022. Support handling directories in the TAR has been added. Added several useful checks during import OVA package.

ApplianceImplIO: Propagate error when closing a file

Export/import OVA/OVF package supports ISO images. The problem with the wrong search files in the archive has been resolved. (see #5429). 2 new elements SASD and EPASD were added in the OVF XML file structure (see #6022).

Main: a couple of whitespace fixes

ApplianceIO: Assertion to catch non sequential accesses

enabled shared clipboard support for Linux hosts (guest=>host only)

Main/Runtime/VBoxManage: SHA256 support comes with OVF 2.0

Main: spaces

Main-OVF: make really sure all data is processed before stopping the reading

VD: Interface cleanup. Merge the two involved structures (generic interface descriptor and callback table) into one, remove the duplicated interface wrappers in the backends and move the interface definitions into separate headers separating public and private interfaces.

sha1WaitForManifestThreadFinished: Read once instead of 4x.

Main-OVF: fix exporting to slow medias

Main: source re-org.