allow page's volume to contain DOT.^
allow DE name to be a single letter.
allow DR to contains {} in its attributes.
add support for the approximate value in CC BP
add lexing error report.
allow FT location to contain ? and number at same time.
parsing journal fix.
fix RX value
add support to parse volume pages.
allow ; inside of gene name.
allow one letter pubmed id.
allow to DOI to contain space.
fix the pp.abstract problem for RL. now it can not take abstract directly. have to prefixed by pp.
allow to parse from the next of the failing one.