Jac/delete site

[jacalata]

functional changes

1. change "continue if exists" to false, to match behavior of original tabcmd
2. fix bug where we tried to call delete on the content url, not the site id
3. make sure to clear the site name for the session when the server name changes
4. run toLower on input so that comparisons with existing saved options is valid

[github-actions]

Coverage Report

File	Stmts	Miss	Cover	Missing
tabcmd
__main__.py	7	7	7	0%
tabcmd.py	12	12	12	0%
tabcmd/commands
commands.py	10	10	10	0%
constants.py	59	11	11	81%
server.py	126	25	25	80%
tabcmd/commands/auth
session.py	283	42	42	85%
tabcmd/commands/datasources_and_workbooks
datasources_and_workbooks_command.py	95	19	19	80%
delete_command.py	59	16	16	73%
export_command.py	126	27	27	79%
get_url_command.py	152	43	43	72%
publish_command.py	58	17	17	71%
runschedule_command.py	20	7	7	65%
tabcmd/commands/extracts
create_extracts_command.py	39	5	5	87%
decrypt_extracts_command.py	26	2	2	92%
delete_extracts_command.py	36	6	6	83%
encrypt_extracts_command.py	26	2	2	92%
reencrypt_extracts_command.py	26	2	2	92%
refresh_extracts_command.py	67	26	26	61%
tabcmd/commands/group
create_group_command.py	28	5	5	82%
delete_group_command.py	26	2	2	92%
tabcmd/commands/help
help_command.py	47	26	26	45%
tabcmd/commands/project
create_project_command.py	45	9	9	80%
delete_project_command.py	34	4	4	88%
publish_samples_command.py	27	4	4	85%
tabcmd/commands/site
create_site_command.py	35	7	7	80%
delete_site_command.py	29	4	4	86%
edit_site_command.py	37	2	2	95%
list_command.py	33	18	18	45%
list_sites_command.py	29	2	2	93%
tabcmd/commands/user
create_site_users.py	45	5	5	89%
create_users_command.py	51	4	4	92%
delete_site_users_command.py	42	5	5	88%
user_data.py	210	30	30	86%
tabcmd/execution
_version.py	2	2	2	0%
global_options.py	138	23	23	83%
localize.py	67	8	8	88%
logger_config.py	40	6	6	85%
parent_parser.py	46	3	3	93%
tabcmd_controller.py	39	5	5	87%
TOTAL	2382	453	81%