patch 8.0.1782: no simple way to label quickfix entries

Problem:    No simple way to label quickfix entries.
Solution:   Add the "module" item, to be used instead of the file name for
            display purposes. (Martin Szamotulski, closes #1757)

runtime/doc/eval.txt

@@ -4737,6 +4737,7 @@ getqflist([{what}])					*getqflist()*
 		list item is a dictionary with these entries:
 			bufnr	number of buffer that has the file name, use
 				bufname() to get the name
+			module	module name
 			lnum	line number in the buffer (first line is 1)
 			col	column number (first column is 1)
 			vcol	|TRUE|: "col" is visual column
@@ -7221,6 +7222,8 @@ setqflist({list} [, {action} [, {what}]])		*setqflist()*
 				buffer
 		    filename	name of a file; only used when "bufnr" is not
 				present or it is invalid.
+		    module	name of a module; if given it will be used in
+				quickfix error window instead of the filename.
 		    lnum	line number in the file
 		    pattern	search pattern used to locate the error
 		    col		column number

runtime/doc/quickfix.txt

@@ -1220,6 +1220,7 @@ you want to match case, add "\C" to the pattern |/\C|.
 Basic items
 
 	%f		file name (finds a string)
+	%o		module name (finds a string)
 	%l		line number (finds a number)
 	%c		column number (finds a number representing character
 			column of the error, (1 <tab> == 1 character column))
@@ -1264,6 +1265,11 @@ conversion can be used to locate lines without a line number in the error
 output.  Like the output of the "grep" shell command.
 When the pattern is present the line number will not be used.
 
+The "%o" conversion specifies the module name in quickfix entry.  If present
+it will be used in quickfix error window instead of the filename.  The module
+name is used only for displaying purposes, the file name is used when jumping
+to the file.
+
 Changing directory
 
 The following uppercase conversion characters specify the type of special