align and refine various growth medium terms

[only1chunts]

Current term details There are 3 terms that overlap:

Term name - plant growth medium
Term ID - MIXS:0001057
Structured comment name - plant_growth_med
Definition - Specification of the media for growing the plants or tissue cultured samples, e.g. soil, aeroponic, hydroponic, in vitro solid culture medium, in vitro liquid culture medium. Recommended value is a specific value from EO:plant growth medium (follow this link for terms http://purl.obolibrary.org/obo/EO_0007147) or other controlled vocabulary
Expected value - EO or enumeration 
Value syntax - {termLabel} {[termID]} or [husk|other artificial liquid medium|other artificial solid medium|peat moss|perlite|pumice|sand|soil|vermiculite|water] 
Example - hydroponic plant culture media [EO:0007067]

Term name - culture rooting medium 
Term ID - MIXS:0001041
Structured comment name - cult_root_med	
Definition - Name or reference for the hydroponic or in vitro culture rooting medium; can be the name of a commonly used medium or reference to a specific medium, e.g. Murashige and Skoog medium. If the medium has not been formally published, use the rooting medium descriptors
Expected Value -name, PMID,DOI or url	
Value syntax - {text}|{PMID}|{DOI}|{URL}
Example - http://himedialabs.com/TD/PT158.pdf

Term name - tissue culture growth media
Term ID - MIXS:0001070
Structured comment name -  tiss_cult_growth_med
Definition - Description of plant tissue culture growth media used
Expected value - PMID,DOI,url or free text
Value syntax - {PMID}|{DOI}|{URL}|{text}
Example - https://link.springer.com/content/pdf/10.1007/BF02796489.pdf

Suggested update(s) There was discussion previously indicating that maybe these terms could be merged into a single term for "growth medium", see ticket #217

[mslarae13]

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