Fix bug regarding variants. Tags with prefix "var" was incorrectly interpreted as "start of variants". Now, only "var" indicates such start. Cleaned up data1_read_node so tag names and variant names are copied and not pointed to by the generated data1 tree. Data nodes still point to old buffer.
Fix bug regarding variants. Tags with prefix "var" was incorrectly
interpreted as "start of variants". Now, only "var" indicates such
start.
Cleaned up data1_read_node so tag names and variant names are
copied and not pointed to by the generated data1 tree. Data nodes
still point to old buffer.

nla/yaz,dcrossleyau/yaz,nla/yaz,nla/yaz,nla/yaz,dcrossleyau/yaz,dcrossleyau/yaz