#some re-assigments to repair Cambria Math drop-outs

#missing glyphs:
\<Midarrow>             code: 0x002550  font: IsabelleText
\<diamond>              code: 0x0025c7  font: IsabelleText
\<triangleleft>         code: 0x0025c3  font: IsabelleText
\<triangleright>        code: 0x0025b9  font: IsabelleText
\<clubsuit>             code: 0x002663  font: IsabelleText
\<diamondsuit>          code: 0x002662  font: IsabelleText
\<flat>                 code: 0x00266d  font: IsabelleText
\<natural>              code: 0x00266e  font: IsabelleText
\<sharp>                code: 0x00266f  font: IsabelleText
\<^bold>                code: 0x002759  font: IsabelleText  abbrev: -.

#swapped assignment of big vs. small version?!
\<oplus>                code: 0x002295  font: IsabelleText  abbrev: +o
\<Oplus>                code: 0x002a01  font: IsabelleText  abbrev: +O
\<otimes>               code: 0x002297  font: IsabelleText  abbrev: *o
\<Otimes>               code: 0x002a02  font: IsabelleText  abbrev: *O
\<odot>                 code: 0x002299  font: IsabelleText  abbrev: .o
\<Odot>                 code: 0x002a00  font: IsabelleText  abbrev: .O