[Font, Todonotes and Ambhora changes]

    -    Changed teh default font to Bitstream Charter without the
         uprightness of the letters.
    -    Fixed the issue of the result large amount of space after
         the differential sign by introducing new symbols for
         \mathrm in ambhora.
    -    Moved todonotes from umred to document class pages in
         order to properly take advantage of the differing margins.
[Reverted tocstyle to default instead of KOMA-like]