Revert damage by #986: work from #985, #989 (#1113)

[rafie]

bad commit: 04574d5
pre bad commit: 84ffb40

Reverted:

allow changing cursor max idle value #985:
setCursorMaxIdle()
getCursorMaxIdle()
configuration: .name = "CURSOR_MAX_IDLE"

Concurrent write mode #989:
setConcurentWriteMode()
getConcurentWriteMode()
configuration:
.name = "SAFEMODE"
.name = "CONCURRENT_WRITE_MODE"
.concurrentMode = 0

[codecov]

Codecov Report

Merging #1114 into 1.6 will decrease coverage by 1.04%.
The diff coverage is 9.09%.

@@            Coverage Diff             @@
##              1.6    #1114      +/-   ##
==========================================
- Coverage   82.97%   81.92%   -1.05%     
==========================================
  Files         144      144              
  Lines       18692    18702      +10     
==========================================
- Hits        15510    15322     -188     
- Misses       3182     3380     +198     

Impacted Files	Coverage Δ
src/config.h	100.00% <ø> (ø)
src/config.c	64.54% <9.09%> (-2.68%)	⬇️
src/concurrent_ctx.h	33.33% <0.00%> (-66.67%)	⬇️
src/indexer.c	51.18% <0.00%> (-41.70%)	⬇️
src/concurrent_ctx.c	32.47% <0.00%> (-38.47%)	⬇️
src/document.c	89.81% <0.00%> (-2.95%)	⬇️
src/module-init/module-init.c	71.83% <0.00%> (-1.41%)	⬇️
src/document_add.c	93.06% <0.00%> (-0.50%)	⬇️
src/doc_table.c	91.22% <0.00%> (-0.36%)	⬇️

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