MTEXT: correction of a redundant ACAD version parameter, correction of subclass maker
MTEXT: correction of a redundant ACAD version parameter.
MTEXT: include members common for all DXF drawable entities.
MTEXT: correct date in copyright note.
MTEXT: modify fp in fp->fp, *line_number in fp->line_number.
MTEXT: use the acad_version_number from the DxfFile struct.
MTEXT: use the acad_version_number from the DxfFile struct.
MTEXT: correct id_code definition.
MTEXT: id_code is hexadecimal number
Merge pull request #17 from paolo-caroni/master

Correction in mtext for follow the new style of writing