query language updates and bugfixes

## Type of Issue

Select the type of issue:
- [ ] Bug report (to report a bug)
- [ ] Feature request (to request an additional feature)
- [x] Tracker (I am just using this as a tracker)
- [ ] Refactor request
- [ ] Documentation Ask

## Description

Use this checklist if you are using this issue as a tracker:

- [x] obj queries with subj fixed in triples
- [ ] subqueries with an "IN" keyword
- [ ] Empty FROM and AND/OR/NOT FROM clauses
- [ ] text/sql-syntactic-sugar format for linear extent attributes
- [ ] x.y.z notation for SELECT
- [ ] document sqly-syntactic sugar in FILTERS readmes, update other docs