Replace bytes with Mbytes in bitarchive settings

Suggest using MBytes instead of bytes in the bitarchive-settings.
Too many digits IMHO.
In the following example:
CONFIG: Requiring at least 2000000000 bytes free.
2005-06-23 16:42:45 dk.netarkivet.bitarchive.BitArchiveAdmin <init>
CONFIG: Using bit archive directory '.\bitarkiv' with 103470418 bytes of content
out of 1000000000000
2005-06-23 16:42:45 dk.netarkivet.bitarchive.BitArchiveAdmin <init>
CONFIG: Using bit archive directory 'q:\bitarkiv' with 24581555390 bytes of
content out of 1000000000000
The numbers could be replaced as follows:
2000000000 bytes => 19073486328125 Mbytes (rounded to 1907)
4 digits instead of 10
1000000000000 => 95367431640625 Mbytes (rounded to 953674)
6 digits instead of 13
Full logging of bitarchive startup:
-----------------------------------
2005-06-23 16:42:45 dk.netarkivet.utils.ApplicationUtils logAndPrint
INFO: Starting dk.netarkivet.distribute.bitarchive.BitarchiveServer
2005-06-23 16:42:45 dk.netarkivet.utils.ApplicationUtils logAndPrint
INFO: dk.netarkivet.distribute.bitarchive.BitarchiveServer Running
2005-06-23 16:42:45 dk.netarkivet.distribute.bitarchive.BitarchiveServer <init>
CONFIG: Storing temporary files at '.\tests\commontempdir'
2005-06-23 16:42:45 dk.netarkivet.bitarchive.Bitarchive <init>
FINE: Starting bit archive
2005-06-23 16:42:45 dk.netarkivet.bitarchive.BitArchiveAdmin <init>
CONFIG: Requiring at least 2000000000 bytes free.
2005-06-23 16:42:45 dk.netarkivet.bitarchive.BitArchiveAdmin <init>
CONFIG: Using bit archive directory '.\bitarkiv' with 103470418 bytes of content
out of 1000000000000
2005-06-23 16:42:45 dk.netarkivet.bitarchive.BitArchiveAdmin <init>
CONFIG: Using bit archive directory 'q:\bitarkiv' with 24581555390 bytes of
content out of 1000000000000
2005-06-23 16:42:45 dk.netarkivet.distribute.bitarchive.BitarchiveServer <init>
CONFIG: Heartbeat frequency: '1000'
2005-06-23 16:42:45 dk.netarkivet.distribute.bitarchive.BitarchiveServer <init>
INFO: Created bitarchive server listening on: SVC_KB_ALL_BA and SVC_KB_ANY_BA
2005-06-23 16:42:45 dk.netarkivet.distribute.bitarchive.BitarchiveServer <init>
INFO: Broadcasting heartbeats on: SVC_KB_THE_BAMON
2005-06-23 16:42:45 dk.netarkivet.utils.ApplicationUtils startApp
FINE: Adding shutdown hook for dk.netarkivet.distribute.bitarchive.BitarchiveServer
2005-06-23 16:42:45 dk.netarkivet.utils.ApplicationUtils startApp
FINE: Added shutdown hook for dk.netarkivet.distribute.bitarchive.BitarchiveServer
NOTE: This bug is originally from Bugzilla bug_id=375.
This bug was previously assigned to Unassigned.