patch 8.0.0515: ml_get errors in silent Ex mode

Problem:    ml_get errors in silent Ex mode. (Dominique Pelle)
Solution:   Clear valid flags when setting the cursor.  Set the topline when
            not in full screen mode.

patch 8.0.0514: script for creating cmdidxs can be improved

Problem:    Script for creating cmdidxs can be improved.
Solution:   Count skipped lines instead of collecting the lines.  Add "const".
            (Dominique Pelle, closes vim#1594)

patch 8.0.0513: getting name of cleared highlight group is wrong

Problem:    Getting name of cleared highlight group is wrong. (Matt Wozniski)
Solution:   Only skip over cleared names for completion. (closes vim#1592)
            Also fix that a cleared group causes duplicate completions.

patch 8.0.0512: check for available characters takes too long

Problem:    Check for available characters takes too long.
Solution:   Only check did_start_blocking if wtime is negative. (Daisuke
            Suzuki, closes vim#1591)

patch 8.0.0511: message for skipping client-server tests is unclear

Problem:    Menuage for skipping client-server tests is unclear.
Solution:   Be more specific about what's missing (Hirohito Higashi, Kazunobu
            Kuriyama)

patch 8.0.0510: typo in link to codecov.io results

Problem:    Typo in link to codecov.io results.
Solution:   Remove duplicate https:.

patch 8.0.0509: no link to codecov.io results

Problem:    No link to codecov.io results.
Solution:   Add a badge to the readme file.

patch 8.0.0508: Coveralls no longer shows per-file coverage

Problem:    Coveralls no longer shows per-file coverage.
Solution:   Add coverage from codecov.io. (Christian Brabandt)

patch 8.0.0507: client-server tests fail when $DISPLAY is not set

Problem:    Client-server tests fail when $DISPLAY is not set.
Solution:   Check for E240 before running the test.

patch 8.0.0506: can't build with ANSI C

Problem:    Can't build with ANSI C.
Solution:   Move declarations to start of block.