move createDocument factory to DocumentFile class
move exists method to DocumentFile
Document: move path to DocumentFile and add id
Document: rename CRC to crc
move exists() to Document
add collection package
Duplicates: add containId, getDuplicates, getTerms
IndexDatabase: use Duplicates collection class
IndexDatabase: use Terms collection class
IndexDatabase: remove unnecessary function call
IndexDatabase: cleaning up
correct name is posting list not post list
move posting list classes to collection package
PDFDocument: PDDocument should be transient
add command to query for include and exclude dir