SOLR-6679: comment out suggester in stock config due to long startup times

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SOLR-6662: better validation when parsing command-line options that expect a value

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SOLR-6705: Add specific JVM version checking to Windows start scripts

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SOLR-6661: Adjust all example configurations to allow overriding error-prone relative paths for solrconfig.xml <lib> references with solr.install.dir system property; bin/solr scripts will set it appropriately. (merged from branch_5x r1634771, manually fixing solr/CHANGES.txt conflict)



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