1. make code normalized, such as LOGCALL
2. add more comments

	modified:   xapian-core/api/lucenefieldproc.cc
	modified:   xapian-core/api/omdatabase.cc
	modified:   xapian-core/api/omdocument.cc
	modified:   xapian-core/api/omenquire.cc
	modified:   xapian-core/api/postingiterator.cc
	modified:   xapian-core/api/query.cc
	modified:   xapian-core/api/queryinternal.h
	modified:   xapian-core/backends/chert/chert_database.cc
	modified:   xapian-core/backends/chert/chert_postlist.cc
	modified:   xapian-core/backends/dbfactory.cc
	modified:   xapian-core/backends/document.h
	modified:   xapian-core/backends/lucene/bytestream.cc
	modified:   xapian-core/backends/lucene/bytestream.h
	modified:   xapian-core/backends/lucene/lucene_alltermslist.cc
	modified:   xapian-core/backends/lucene/lucene_alltermslist.h
	modified:   xapian-core/backends/lucene/lucene_database.cc
	modified:   xapian-core/backends/lucene/lucene_database.h
	modified:   xapian-core/backends/lucene/lucene_document.cc
	modified:   xapian-core/backends/lucene/lucene_document.h
	modified:   xapian-core/backends/lucene/lucene_fdtxtable.cc
	modified:   xapian-core/backends/lucene/lucene_fdtxtable.h
	modified:   xapian-core/backends/lucene/lucene_fnmtable.cc
	modified:   xapian-core/backends/lucene/lucene_fnmtable.h
	modified:   xapian-core/backends/lucene/lucene_frqtable.cc
	modified:   xapian-core/backends/lucene/lucene_frqtable.h
	modified:   xapian-core/backends/lucene/lucene_nrmlist.cc
	modified:   xapian-core/backends/lucene/lucene_nrmlist.h
	modified:   xapian-core/backends/lucene/lucene_nrmtable.cc
	modified:   xapian-core/backends/lucene/lucene_nrmtable.h
	modified:   xapian-core/backends/lucene/lucene_postiterator.cc
	modified:   xapian-core/backends/lucene/lucene_postiterator.h
	modified:   xapian-core/backends/lucene/lucene_segdb.cc
	modified:   xapian-core/backends/lucene/lucene_segdb.h
	modified:   xapian-core/backends/lucene/lucene_segmentgentable.cc
	modified:   xapian-core/backends/lucene/lucene_segmentgentable.h
	modified:   xapian-core/backends/lucene/lucene_segmenttable.cc
	modified:   xapian-core/backends/lucene/lucene_segmenttable.h
	modified:   xapian-core/backends/lucene/lucene_stattable.cc
	modified:   xapian-core/backends/lucene/lucene_stattable.h
	modified:   xapian-core/backends/lucene/lucene_term.h
	modified:   xapian-core/backends/lucene/lucene_termindex.cc
	modified:   xapian-core/backends/lucene/lucene_termindex.h
	modified:   xapian-core/backends/lucene/lucene_tiitable.cc
	modified:   xapian-core/backends/lucene/lucene_tiitable.h
	modified:   xapian-core/backends/lucene/lucene_tistable.cc
	modified:   xapian-core/backends/lucene/lucene_tistable.h
	modified:   xapian-core/examples/lucene-copydatabase.cc
	modified:   xapian-core/include/xapian/postingiterator.h
	modified:   xapian-core/matcher/localsubmatch.cc
	modified:   xapian-core/matcher/multiandpostlist.cc
	modified:   xapian-core/matcher/multimatch.cc
	modified:   xapian-core/weight/weightinternal.cc
	modified:   xapian-core/weight/weightinternal.h