Add support of waiting pattern in case not closed brackets

[snuyanzin]

There is an update of waiting pattern for quotes and comments implemented at #129.
It also makes sense to have support for non-closed (not quoted and not commented) brackets ) and may be ] (could be used in MS SQL)

[snuyanzin]

The implementation detects non-closed round/square brackets for instance

sqlline> select count(
. . . )>

it also could detect extra brackets like

sqlline> select count)2)
extra ')'>

The whole table for waiting patterns now looks like

Prompt	Meaning
sqlline>	Ready for a new query
semicolon>	Waiting for next line of multiple-line query, waiting for completion of query with semicolon (;)
quote>	Waiting for next line, waiting for completion of a string that began with a single quote (')
dquote>	Waiting for next line, waiting for completion of a string that began with a double quote (")
*/>	Waiting for next line, waiting for completion of a multiline comment that began with /*
)>	Waiting for next line, waiting for completion of a string that began with a round bracket (
]>	Waiting for next line, waiting for completion of a string that began with a square bracket [
extra ')'>	There is an extra round bracket ) which is not opened with (
extra ']'>	There is an extra square bracket ] which is not opened with [

[julianhyde]

Fixed in d3802ae, PR #159; thanks @snuyanzin!