P1 Remove empty rows / columns from inflection table

[parthopdas]

These require intrusive design changes and will need to be handled separately. v @bdhrs if any of these are super-urgent let me know.

[Moved from /issues/27]

• remove empty columns in "a1 card" e.g pañca
  
• remove empty columns in "dvi card" e.g. dvi
  
• masc fem nt nouns need only 1 header line