Display a warning when store cache setting is low versus the memory setting

We should have a warning displayed in the following cases (proposal):

1/ Memory VM max setting is lower than 500Mb

• lower than 200Mb "Memory setting is VERY low"
• lower than 500Mn "Memory setting is low"

2/ Store cache setting is lower than 2000

• lower than 2000 and VM is more than 1Mb "Cache setting is low compared to the VM memory setting. You should set to 2000."
• lower than 1000 and memory more than 750Mb "Cache setting is low compared to the VM memory setting. You should set to 1000."
• lower than 500 and memory more than 500Mb "Cache setting is very low. You should set to at least 500."

3/ Store cache setting is too high compared to VM Memory setting

• higher than 100 and memory lower than 200Mb: "Cache setting is too high compared to the VM Memory setting. You should increase memory or set cache to 100 (which is not recommended)"
• higher than 500 and memory lower than 500Mb: "Cache setting is too high compared to the VM Memory setting. You should increase memory or set cache to 500"