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ql: replace string(int) conversions w/ string(rune(int))

Closes #220

See merge request !217

Fixes #220.

Fixes #219.

Fix failing test. Newlines are not alowed in identifiers between guillemets.

See merge request !212

Implement delimited identifiers between guillemets.

Closes #210

See merge request !207

This allows key words and other formerly not allowed identifiers to be used.
Guillemets were chosen because all other string escapes were already used
in the grammar of QL.
Also implemented some unit tests.
Fixes issue #210

Implement the SQL standard COALESCE function.

Closes #211

See merge request !209

This function returns the first non-NULL argument, or NULL if all are NULL.
Argument count is unlimited.
Includes a test in testdata.ql.
Fixes #211.

To use the new format for newly created databases set the FileFormat field
in *Options passed to OpenFile to value 2 or use the driver named "ql2"
instead of "ql".

- Both the old and new driver will properly open and use, read and write the
  old (V1) or new file (V2) format of an existing database.

- V1 format has a record size limit of ~64 kB. V2 format record size limit
  is math.MaxInt32.

- V1 format uncommitted transaction size is limited by memory resources. V2
  format uncommitted transaction is limited by free disk space.

- A direct consequence of the previous is that small transactions perform
  better using V1 format and big transactions perform better using V2
  format.

benchmark                        old ns/op      new ns/op      delta
SelectOrderedFile1kBx1e4-4       1329006807     255517723      -80.77%
CrossJoinFile1e3NoX1e4-4         3107615747     619794528      -80.06%
CrossJoinFile1e4NoX1e3-4         3354802646     700357061      -79.12%
SelectOrder...

Fixes #205.

ql: add support for Go module

	modified:   all_test.go
	modified:   storage.go

	modified:   Makefile
	modified:   all_test.go
	modified:   driver1.8.go
	modified:   go1.8_test.go
	modified:   parser.go
	modified:   ql.y
	modified:   scanner.go
	modified:   scanner.l

issue190: add test to show argument order issue