Add logical operators to issue and other search - and, not, or

Description

Issue searching is good but simplistic. We need the ability to create more complex searches using logical operators to narrow down results. Right now, multiple search criteria can be entered but every one added is ASSUMED to be an 'AND' logical operator.

Proposal

Provide some simple extensions to search queries to allow for more complex searches

start by allowing logical operators like AND, OR, NOT for issue searches may want to include parenthetical evaluation Review JQL to see for any additional inspiration - Jira Query Language - see links below

Links / references

Reference: JQL - Jira query language - https://confluence.atlassian.com/jirasoftwarecloud/advanced-searching-764478330.html https://blogs.atlassian.com/2013/01/jql-the-most-flexible-way-to-search-jira-14/?_ga=1.2418099.266044726.1485301648 http://blogs.atlassian.com/2013/02/jql-the-most-flexible-way-to-search-jira-24/