shared/uicore: remove UI_HIDE_AUTOLOGIN

we never used it and it doesn't make much sense to make this checkbox optional

Also some whitespace/tab cleanups
shared/uicore: also en/disable the autologin checkbox on login (error)

fixes #476

NOTE: this is a candidate for the stable branch
usercore: remove unused class TestTask
uicore: remove useless needForceUpdate method in UICore class

also fixes clang static-analyzer warning "This statement is never executed"
usercore/ToolManager: remove unused variable in startDownload

also fixes clag static analyzer warning "Value stored to 'bIsDownloading' is never read"
ipc_pipe/IPCPipeBase: remove unused function "print_buffer"

also fixes clang static analyzer warning "This statement is never executed"
cmake/v8: move away from svn

v2: add note about V8_URL option in the CMakeLists.txt file
Merge pull request #596 from karolherbst/clang-static-analyzer

some unused stuff I found while going through clangs static analyzer issues
Merge pull request #594 from karolherbst/bug476

shared/uicore: also en/disable the autologin checkbox on login (error)
Merge pull request #593 from karolherbst/hide_autologin

shared/uicore: remove UI_HIDE_AUTOLOGIN
Merge pull request #590 from karolherbst/bug567

cmake/v8: move away from svn and update to newer v8 version
version: note #476 fix in changelog
version: note #491 and #590 fix in changelog