(?) Comma-delimited list of key/value pair search terms.

Keys are column names. Values are search terms.

Example:  [column1=foo*, column2<100, column3=2013-2016.06.30]

String fields:
- '*' represents any character
- '?' represents one character
- Use single or double quotes for phrases
   e.g. [column='foo bar'] - The term 'foo bar'
- Multiple search terms are ORed
   e.g. [column=foo bar] - 'foo' OR 'bar'
- Prepend '+' on tokens that must match
   e.g. [column=+foo* +*bar] - Start with 'foo' AND end with 'bar'.
- Prepend '-' on tokens that must not match
   e.g. [column=+foo* -*bar] - Start with 'foo' AND does not end with 'bar'.

Numeric fields:
[column=123] - A single number
[column=1 2 3] - Multiple numbers
[column=1-100] - Between two numbers
[column=1-100 200-300] - Two ranges of numbers
[column>100] - Greater than a number
[column>=100] - Greater than or equal to a number
[column=!123] - Not a specific number

Date/Calendar fields:
[column=2001] - A specific year
[column=2001.01.01.10.50] - A specific time
[column>2001] - After a specific year
[column>=2001] - During or after a specific year
[column=2001-2003.06.30] - A date range
[column=2001 2003 2005] - Multiple ORed dates

(?) Comma-delimited list of columns to display.

Example:  [column1, column2]

(?) Comma-delimited list of columns to sort by.
Columns can be suffixed with '-' to indicate descending order.

Example:  [column1, column2-]

Notes:
- Columns containing collections/arrays/lists are sorted by size.