Reporting DB scanner progress once per second seems enough

git-svn-id: svn://svn.code.sf.net/p/autowikibrowser/code/AWB@9897 5227b50d-9349-4574-b055-4b0a7525e11c
Correct formatting of progress percentage display (always show 3 dp even if any trailing zeros)

git-svn-id: svn://svn.code.sf.net/p/autowikibrowser/code/AWB@9898 5227b50d-9349-4574-b055-4b0a7525e11c
DirectoryDelimiter function so log files written correctly under mono

git-svn-id: svn://svn.code.sf.net/p/autowikibrowser/code/AWB@9899 5227b50d-9349-4574-b055-4b0a7525e11c
HandleException: if we display an exception write it to debug file as well (debug builds only)

git-svn-id: svn://svn.code.sf.net/p/autowikibrowser/code/AWB@9900 5227b50d-9349-4574-b055-4b0a7525e11c