do not skip the blocks of smaller fonts between the selected blocks in the same line

[metebalci]

An example is given in #47, from the log output:

INFO/pdftitle.py: (<PDFType1Font: basefont='NIQPDG+PLRoman10-Bold'>, 10.91, 57.75, -81.77, ['E', 'x', 'p', 'l', 'i', 'c', 'i', 't'])
INFO/pdftitle.py: (<PDFType1Font: basefont='FHQCIW+PLRoman10-Regular'>, 9.96, 104.69, -81.77, ['4'])
INFO/pdftitle.py: (<PDFType1Font: basefont='NIQPDG+PLRoman10-Bold'>, 10.91, 109.67, -81.77, ['-', 'd', 'e', 's', 'c', 'e', 'n', 't', 's', 'o', 'n', 'a', 'n', 'e', 'l', 'l', 'i', 'p', 't', 'i', 'c', ...

The title is "Explicit 4-descents on an elliptic curve" with "4" written differently. "4" is using a smaller font (and eliot-tfs=0,1 does not work properly because the same font is also used in other places), and it is skipped when selecting the blocks. It would make sense to not skip this because they are all on the same y position (-81.77).