issue8 add remove to libtocc
add test file
remove an unused header
add "return" to the doc of libtocc::file_engine::delete_file()
delete an unused header
1) adding overloads of Manager::remove_file()
2) changing functions name files_engine::delete_file() to files_engine::remove_file()
3) changing functions name Manager::delete_file() to Manager::remove_file()
4) adding asserts to unit tests to test the overloaded functions
change return type of Database::remove_file()
remove an array of files in the jx9 script instead of removing files one by one
add spaces in for loops
silently ignore the unfounded files and delete the founed ones
add the algorithm to convert FileInfoCollection to a vector of string ids to Utilities/file_info_converter
correct the exception throw message
move the exception throw to database layer
correct the functions incorrect comments
function's comment update
merge with issue8