combine two or more data of the same format into one file

[mustachemo]

standard feature from the client

[Koltheguy]

inital implementation seems to work well, without defined datatypes, combining two datasets may lead to different rows that won't "drop duplicate"

[Koltheguy]

Commit 772b8242268c706a54079fe0216a70bb8ac0f127 addresses this issue

[mustachemo]

1. Importing two files needs work, sometimes certain rows are overridden by other file (i.e. some rows are deleted) 1.1. Not all rows are displayed (probably because or rows being overridden)

2. empty columns not being shown

[Koltheguy]

works as intended, duplicate rows are dropped. column mismatched will be ignored.