parsers BUGFIX making canonical form of decimal64 value
parsers BUGFIX making canonical form of decimal64 value

in case of havin zeros after decimal point (e.g. 0.01 for fraction-digits 2),
the value was incorrectly printed with not enough leading zeros.

Fixes #289

PavolVican/libyang,PavolVican/libyang,PavolVican/libyang,PavolVican/libyang,PavolVican/libyang