Merge branch 'hotfix/2.0.8'
added error chart on tree

Signed-off-by: MwangiKevin <mwangikevinn@gmail.com>
made a correction on procedure error_charts_data
cleaning the code

Signed-off-by: MwangiKevin <mwangikevinn@gmail.com>
Merge branch 'feature/data_corrections' into develop
Merge branch 'feature/db_procedures' into develop

Conflicts:
	application/modules/charts/models/equipment_model.php
Merge branch 'feature/drilldown' into develop
Merge branch 'release/2.1.0'
code cleaning

Signed-off-by: MwangiKevin <mwangikevinn@gmail.com>
code cleaning

Signed-off-by: MwangiKevin <mwangikevinn@gmail.com>
made corrections to equipment_tests_column procedure

Signed-off-by: MwangiKevin <mwangikevinn@gmail.com>